The above \(b \rightarrow s \ell \ell \)  anomalies can be be analyzed in a model independent framework using the language of effective field theory. However, there can be a number of approaches under which the global analysis of \(b \rightarrow s \ell \ell \)  data can be performed. The most common framework is where new physics is assumed to be present only in \(b \rightarrow s\, \mu ^+\,\mu ^-\)  decay [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}, [8]}, [9]}, [10]}, [11]}, [12]}, [13]}. In another approach, new physics is allowed to be present in electron sector along with muons with non equal Wilson coefficients (WCs) [10]}, [15]}, [16]}.
Thus in both of these approaches, the new physics couplings are non-universal in nature.
